This IGBT Heatsink Black Anodized is a CNC-machined aluminum heat sink designed for insulated-gate bipolar transistor modules. You get a flatness of 0.05 mm across the mounting sur
IGBT Heatsink Black Anodized | Precision CNC by BQUQ China
This IGBT Heatsink Black Anodized is a CNC-machined aluminum heat sink designed for insulated-gate bipolar transistor modules. You get a flatness of 0.05 mm across the mounting surface, a surface fini
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This IGBT Heatsink Black Anodized is a CNC-machined aluminum heat sink designed for insulated-gate bipolar transistor modules. You get a flatness of 0.05 mm across the mounting surface, a surface finish of Ra 0.8 µm, and a 25 µm black anodized coating that boosts emissivity to 0.85. We ship from our Dongguan factory in 12 days, and the anodized layer passes a 500-hour salt spray test.
Why the 0.05 mm Flatness on the Mounting Pad Matters for IGBT Junction Temperature
IGBT modules transfer heat through a thin layer of thermal paste or phase-change material. If your heatsink pad is not flat, the paste fills air gaps unevenly, and junction temperature rises by 15–20 °C. We machine the mounting pad on a 3-axis CNC with a dedicated finishing pass, holding flatness to 0.05 mm over a 200 mm length. That is not a marketing number—every unit is checked with a granite surface plate and a dial indicator before anodizing.
Aluminum 6063-T5 vs. 6061-T6: Which Base Alloy We Recommend for Your IGBT
We stock both 6063-T5 and 6061-T6 for this IGBT heatsink black anodized series. 6063-T5 has a thermal conductivity of 201 W/m·K and is easier to extrude into complex fin geometries. 6061-T6 offers 167 W/m·K but better mechanical strength for vibration-heavy applications. For most IGBT modules (e.g., SEMIKRON, Infineon, Mitsubishi), we default to 6063-T5 because the black anodized coating adheres more uniformly to its surface. If you are mounting a 300 A module with high mechanical stress, we switch to 6061-T6 and confirm with you.
How the 25 µm Black Anodize Layer Improves Heat Dissipation Beyond Paint
Black anodizing is not just cosmetic. The porous oxide layer increases surface emissivity from 0.1 (bare aluminum) to 0.85. In natural convection or low-airflow enclosures, this radiative heat transfer accounts for 30–40 % of total cooling. Our Type II anodize process is controlled at 25 µm thickness (range 22–28 µm) with a black dye sealed in boiling deionized water. We do not use thin decorative anodizing—it cracks at 100 °C. This layer withstands 200 °C continuous service without peeling.
CNC Fin Machining: How We Cut 1.5 mm Thick Fins Without Warping
Fins thinner than 2 mm tend to vibrate and warp during milling. Our CNC program uses a high-speed spindle at 15,000 RPM with a 2-flute carbide end mill, combined with a vacuum fixture that holds the blank from below. We take a roughing pass at 0.5 mm depth and a finishing pass at 0.1 mm. The result: fin thickness tolerance of ±0.1 mm, fin spacing of 5 mm (standard), and zero burrs on the fin tips. For a 120 mm × 120 mm × 80 mm heatsink, we cut 18 fins in 11 minutes per unit.
Black Anodize Quality Control: Salt Spray, Thermal Cycling, and Adhesion Tests
We do not ship anodized parts without three tests. First, a 500-hour neutral salt spray test (ASTM B117) confirms no corrosion on the anodized surface. Second, we run a thermal cycling test from -40 °C to +150 °C for 100 cycles—the coating must not blister or chip. Third, a tape adhesion test (ASTM D3359) ensures the dye and oxide layer stay bonded. We include a printed test report with every batch, referencing your part number and date code.
Inspection Before Every Shipment: CMM, Flatness, and Coating Thickness
Each IGBT heatsink black anodized unit goes through a 3-step QC gate. Step one: a coordinate measuring machine (CMM) checks all hole positions and mounting pad flatness to ±0.02 mm. Step two: a surface roughness tester verifies Ra 0.8 µm on the pad and Ra 1.6 µm on the fins. Step three: an eddy-current coating thickness gauge measures the anodize layer at five points per unit. If any point is below 22 µm, the unit is stripped and re-anodized. We archive CMM data in PDF format and send it with your shipment.
Lead Time and MOQ: How We Hit 12 Days Without a Minimum Order
We keep 6063-T5 aluminum blanks in stock for the most common sizes (100–200 mm length, 80–150 mm width, 40–100 mm height). For those, our lead time is 12 days from drawing approval to shipping, including anodizing. For custom sizes or 6061-T6 material, add 3–5 days. We operate with no MOQ—order one prototype or 1,000 units. The setup cost is the same, so single-piece pricing is higher, but you pay no minimum quantity penalty. This is precision manufacturing made in China with a transparent, fixed timeline.
Customizing Hole Patterns and Threads for Your IGBT Module Footprint
IGBT modules have specific mounting hole patterns (e.g., 2-hole, 4-hole, or 6-hole per module). You send us the module datasheet or a PDF with hole coordinates, and we program the CNC accordingly. We can tap M3, M4, M5, or M6 threads with a depth tolerance of ±0.5 mm. We also add counterbores for shoulder screws. If you need a threaded insert for repeated disassembly, we press in brass or stainless inserts before anodizing. No extra tooling charge for up to 4 different hole patterns in one batch.
Spec
Value
Notes
Base material
6063-T5 or 6061-T6 aluminum
Stock availability confirmed per order
Thermal conductivity
201 W/m·K (6063) / 167 W/m·K (6061)
ASTM E457 test method
Mounting pad flatness
0.05 mm over 200 mm
CMM verified, granite plate backup
Surface finish (pad)
Ra 0.8 µm
After CNC finishing pass
Surface finish (fins)
Ra 1.6 µm
No secondary polishing needed
Anodize thickness
25 µm (22–28 µm range)
Type II, black dye, sealed
Emissivity (anodized)
0.85
At 100 °C, infrared reflectometer
Fin thickness
1.5 mm (custom 1.2–3.0 mm)
Tolerance ±0.1 mm
Fin spacing
5 mm standard
Custom 3–10 mm
Max part size
600 mm × 300 mm × 150 mm
Larger on request
Lead time
12 days (stock blank)
+3–5 days for custom alloy
MOQ
No MOQ
Prototype to mass production
FAQ: Ordering and Engineering Questions
What is the minimum order quantity (MOQ) for this IGBT heatsink black anodized?
No MOQ—we accept a single prototype unit or 1,000+ pieces, and the per-unit price adjusts only for setup time and material quantity.
Can you customize the mounting hole pattern for my specific IGBT module?
Yes, send us your module datasheet or a simple 2D drawing with hole coordinates, and we will machine the pattern to ±0.02 mm accuracy.
How do you ensure the black anodize does not peel off during thermal cycling?
We run a -40 °C to +150 °C thermal cycling test (100 cycles) on a sample from every batch, and we only release parts that pass with zero blistering or delamination.
What is your realistic lead time if I need a rush order?
Standard is 12 days, but for a small batch (≤ 20 units) with stock blanks, we can ship in 7 days by prioritizing your job on the CNC line.
Get a Firm Quote in 12 Hours—Send Your Drawing Today
Send your IGBT heatsink drawing or a photo of the module footprint to sc@bquq.com or WhatsApp +86 13713157787. We reply with a firm unit price, lead time, and a DFM note within 12 hours. For better precision, review our CNC machining tolerances guide to set your expectations, and check the CNC cutting tool selection guide if you are designing fins or thin walls. No MOQ, no hidden tooling fees—just precision manufacturing made in China with a 12-day lead time.
